Intrepid users recently discovered January's PS+ games that have yet to be confirmed by Sony, but as the article on Dualshockers states, the site confirmed a video in the "Free Games" section of the Playstation Store.
PS4: Don't Starve
PS3: DmC: Devil May Cry, Bioshock Infinite, Brothers: a Tale of Two Sons
PS Vita: Smart as…, Worms Battle Islands
Playstation Plus is a subscription service for Sony console owners, that grants a few titles a month for each platform, as well as gives the ability to play multiplayer in certain titles it is otherwise restricted, exclusive events, and sales that are only for Plus members.
Bioshock Infinite and Brothers: A Tale of Two Sons were both nominated for, and won, multiple game of the year awards, and Don't Starve was widely regarded as one of the indie darlings of the year as well. Bioshock also has some compelling DLC titled Burial at Sea, which returns gamers to the underwater world of Rapture. Check out the video above for a bit of background on the add-on, which will receive it's second chapter soon according to Irrational Games.